21.Who isn’t your sister and isn’t your brother，but is still a child of your mother and father?

22.What has teeth but can’t eat?

23.What kind of man can raise things without lifting them?

24.Which candle burns longer:a black one or a white one?

25.Why does a cook wear a high，white hat?

26.Can you name five days of the week without saying: Monday， Tuesday，Wednesday，Thursday，Friday?

27.What kind of dog never can bite and bark?

28.What has a soft bed but never sleeps，a big mouth but never speaks?

29.Four girls have a basket with four apples in it.How can you divide the apples so that each girl gets a whole apple and one still remains in the basket?

30.Which eight-letter word has one letter in it?

Keys (III)

21.You yourself are.

22.A comb.

23.A farmer.He can raise pigs， chickens and so on without lifting them.

24.Neither.Because all candles burn shorter.

25.To cover his head.

26.The day before yesterday，yesterday，today， tomorrow， and the day after tomorrow.

27.A hot dog.

28.A river.

29.Give three girls an apple each，and give the fourth girl her apple in the basket.

30.Envelope.